Combined low air pressure and water treatment effect on chlorophyll and nitrogen content in <i>T</i>. <i>pratense</i> and <i>H</i>. <i>pilosella</i>.

Interactive effects of pressure [kPa] and water treatment on <b><i>(a)</i></b> chlorophyll content (n = 20) and <b><i>(b)</i></b> N content in aboveground biomass (n = 10) of <i>T</i>. <i>pratense</i> and <i>H</i>. <i>pilosella</i>, at t2. The blue, yellow, and purple boxplot indicate the three different air pressures tested in the chambers (85, 75, and 62 kPa). Lowercase letters indicate significant differences according to the post hoc test comparison (p < 0.05). Dots out of the whisker interval represent outliers. (DOCX)